【摘要】 利用核磁共振技术,对鄂尔多斯盆地西南部长8超低渗砂岩可动流体进行测试.研究表明,超低渗砂岩T2截止值分布在3.96~23.14 ms之间,可动流体百分数高、分布范围宽;超低渗、特低渗砂岩不同尺寸喉道半径控制的可动流体体积明显不同,超低渗砂岩的可动流体主要分布在0.1~0.5μm喉道半径区间;不同尺寸喉道半径区间可动流体百分数随渗透率的变化规律截然相反,主要原因在于毛细管渗析作用和驱替作用在不同尺寸喉道中作用力大小不同;进一步确定0.5×10-3μm2为盆地西南部长8储层可动用渗透率的下限值,为科学合理的开发超低渗油藏提供了理论依据.更多还原

【Abstract】 The sandstone samples of the ultra-low permeability reservoir in southwest chang 8of Ordos Basin were tested with the nuclear magnetic resonance technique.The results show that the ultra-low permeability sandstone T2,cutoff value distributes between 3.96~23.14 ms.The content of movable fluid is high,and the parameter of movable fluid is expanse.The movable fluids of ultra-low permeability and low permeability sandstone are distinct in holes of different sizes,and the ultra-low permeability sandstone movable fluid distributes in 0.1~0.5μm.The conversion law of movable fluid percentage and permeability in holes of different sizes is converse,because the relative size of capillary dialysis and flooding is different.And the 0.5×10-3μm2 is defined as the lower permeability limit of water flooding in southwest chang 8of Ordos Basin.更多还原